Heat treating apparatus for metal work



Jupe s, 1933. i H. ROSENBERG 1,913,090

HEAT TREATING APPARATUS FOR METAL WORK m his ma' June 6, 1933. l H.ROSENBERG 1,913,090

HEAT TREATING APPARATUS FOR METAL WORKV Filed Aug. 20, l19551 5Sheets-Sheet 2 HEYMAN RUS ENE ERB,

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June 6, 1933. Ht ROSENBERG 1,913,090

HEAT TREATING APPARATUS FOR METAL WORK Filed Aug. 20, 1931 5Sheets-Sheet 3 HEYMAN RUSENBERE,

June 6, 1933. H. Rosi-:NBERG I 1,913,090

HEAT TREATING APPARATUS FOR METAL WORK Filed Aug. 20, 1951 5Sheets-Sheet 4 HBYMAN RDSENBERE,

if amg June 6, 1933. H, ROSENBERG 1,913,090

HEAT TREATING APPARATUS FOR METAL WORK Filed Aug. 20, 1931 5Sheets-Sheet 5 FI E- El V Q9 51V 55 j L 55 A54 5a DD Se @D Q A O L` ,A

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` Patented June 6, 1933 i Parral oFFlcE HEYMAN nosminae, or NEW YORK, n.Y.

naar 'firearms APPARATUS ronivm'rrn:r wenn" Applicationled August 20,1931. -Seral No. 558,413.

In the case-hardening and other heat treating of small metal articles,`1have found `the apparatus disclosed in my U. S. Letters Patent No. 1,786,508, dated` December 30,

5 1930, and also the apparatus disclosed in myco-pending applications,one filed September 24, 1929, Serial No. 394,832, and the otherl filedApril 29, 1980, Serial No. 448,349, gratifyingly eficient for thepurpose intend- 1 ed, and it is one of the objects of the presentinvention to provide an apparatus for treat ing larger articles, whichapparatus is susceptible by very slight modification of beingtransformed into substantially the same r or the mechanical equivalentof the same apparatus'as` set forth in my saidpatent and pendingapplications, so thatthe present improved apparatus is well adapted foruse primarily for the treatment of larger articles While enabling theuser, without any substantial expense, to transform the plant into onefortreating the smaller articles and again transform the plant to` itspresent adapted use. 1

It should be` understood, therefore,that i throughvarious details of my'said patent and pending applications, and other of my pendingapplications, have been omitted from the disclosure in the accompanyingdrawings, such omission is for the purpose of clarity of disclosure ofthe new matter, and such details may be used with such new matter lor inthe transforming of the plant for the treatment ofthe smaller articlesto any extent found available and desirable; and, to that end, referenceis had to my said patent and.` pending applications for details such asare susceptible of` ready application to and use with the plant hereinset forth. E i It should, of course, be understood that While thepresent improved plant is especiali ly adapted for the treating oflarger articles l, as `compared with the smaller articles of o saidpatent andV pending applications, the `term larger must be accepted infits relative `sense andlimited to physically` available possibilities,as, forexample, the smallerarticles, while not tombe definitely limited,may be represented by such products as screws, screwnails, washers,nuts, bolts, and the like, and the larger articles, while not to bedefinitely limited, may be pinions, gears, discs, and like devices suchas are commonly employed in automobile construction, and the range ofsizes willbe limited only by the available physical capacity of the workholders and containers provided. The actual size of the article to betreated, therefore, is not to be considered a determining factor exceptwhere `it is too small or too large to be conveniently or effectivelyhandled by the apparatus disclosed.

Among the objects in view is'tlre successiveheat treatment of articlesof metal work under conditions affording effective results at anexpenditure of minimum cost and minimum time. j

j Another important object is the arrangement of the plant as acondensed unit for a substantial saving of space.

All of the numerous objects set forth in my above-mentioned patent andpending applications are also true of the present invention as appliedto the treatment of larger articles, and specifically true ofthe plantwhen transformed for the treatment` of smaller articles. i

A still further and more detailed object is the ready transporting of awork holder B0 successively to successive points of treatment bymechanical apparatus not requiring manual intervention for the location,deposit or detachment ofthe work holder from its carrying means, and inthis connection a still more specific object is the swinging of` thewlork holder through an arc from point to point for successive treatmentWithout the necessity for complicated Y or expensive vehicles oftransportation.

With these and other objects in view as will in part hereinafter becomeapparent and in part be stated, the invention includes the provision ofsuccessive heat treating apparatus and simple,V easily-operated meansfor detachably transporting work holders successively to the points oftreatment.

The invention also includes housings or enclosures for all suchapparatusforconserving-heat, preventing the work holders from exposure to chillduring transportation from point to point, and for exhausting vapors andgases without releasing the same into the space occupied by operators.

The invention also comprises certain other novel constructions,combinations, and arrangements of parts as will hereinafter be madeclear and be subsequently pointed out in the appended claims.

In the accompanying drawings,-

Figure 1 is a longitudinal, vertical, central section through acompletely organized plant embodying the features of the presentinvention, parts being seen in elevation.

Figure 2 is an enlarged, detailed, fragmentary sectional yelevation ofone of the work holder arms and adjacent parts, showing a work holder inposition.

Figure 3 is a side elevation of the same parts seen from a plane atright angles to the plane of the section of Figure 2.

Figures 4, 5, and 6 are further enlarged, detailed elevations showingthe successive positions of the pick-up hook for the work holder,cooperating parts being seen fragmentarily in elevation and in section.

Figure 7 is a top plan view of the discharging tray from the quenchingbath seen detached, and shown on a scale approximately that of Figures 2and 3 but slightly smaller.

Figure 8 is a fragmentary, sectional elevation of the parts seen inFigure 7, the section being taken on the plane indicated by line 8-8 ofFigure 7.

Figure 9 is a transverse, vertical section taken on the plane indicatedby line 9 9 of Figure 8.

Figure 10 is a fragmentary, enlarged, vertical section takentransversely through one of the marginal parts of the discharge tray atthe place of the pivot pin for the work holder receiving cradle.

Figure 11 is an inverted plan view of a Work holder detached. Figure 12is an enlarged, detailed elevation of one of the arms of the work holdershowing the preferred serrated form of'its upper edge for facilitatingretaining articles' of work in spaced relation.

Referring to the drawings by numerals, 1 and 2 indicate furnaces, and-3a quenching vat arranged preferably as seen in alinement and having theupper areas above them enclosed in a suitable hood or housing i providedwith discharge flues `5, 5, Lfor carrying off the gases, fumes, andvolatiles from the plant. The flues 5 are, of course, preferablyconnected with appropriate draft apparatus, not illustrated, and thevelocity of the draft may be controlled by slide dampers 6 to insureagainst escape of objectionable fumes into the room or other areaoutside the treating apparatus. A receiving line with the several partsof the plant, the table being preferably sustained on a framework 8supporting a hopper 9, which hopper is not used While the table 7 isemployed, but the hopper 9 in intended for use when the plant istransformed into one for treating smaller articles, as will be readilyunderstood by reference to my above-mentioned patent.

The furnaces 1 and 2 are, of course, susceptible of a wide range ofvariation. One form of furnace found to be quite acceptable is thatutilizing gas as a fuel, but the invention is not to be limited to thecharacter of fuel or types of furnace employed.

Mounted on and forming part of the cover of each furnace 1 and 2 is aplate 10 which is centrally apertured to accommodate the passage of areceptacle or housing mounted to detachably extend into the furnace, thesaid receptacle being indicated at 11 for furnace 1 and at 12 forfurnace 2. Receptacle 11 is preferably of the type adapted to take theplace of the common drum or like housing customarily employed inpreheating articles to be tempered, and the receptacle 12 is preferablya pot for containing cyanide in a molten condition, or like treatingbath. The vat 3 is supplied with water or oil, or other appropriatequenching fluid, and its temperature is preferably maintained low bycirculation after the manner set forth in my abovementioned patent.

As clearly seen in Figures 5 and 6, each of the receptacles 11 and 12(12 only being seen in these figures) is provided with a peripheralflange 13 at its upper edge which overhangs and rests on plate 10, orother parts t of the cover of the respective furnace. At the line ofjuncture between the flange 13 and the respective receptacle 11 or 12the wall of the receptacle is rounded at 14 to prevent the presentationof a sharp edge, and to aid in' the camming action of the work holder ashereinafter mentioned.

The furnaces 1 and 2 and the vat 3, as well as frame 8, may be and arepreferably rigidly connected together so as to stand as substantially acontinuous framework, and the mounting of various parts hereinafterdescribed on that framework is controlled largely by the considerationof facility, convenience, and effectiveness of location. With this inmind, there outstands from the said framework, and preferably from thatpart of it making up the plate 10 of furnace 2, a pair of sleeves 15 inwhich is journaled a shaft 16 which shaft extends through pendent eyes17 of an operating lever 18, which is bifurcated to produce arms 19 andto provide a space between said arms through which a work holder may beswung. These parts are arranged at that side of furnace 2 adjacentfurnace 1 so that the arms 19 overhang the furnacel withthe free endsofthe arms 19 extending beyond the 4transverse i center line of thereceptacle 11.

Atthe opposite side of furnace 2 and carried by the framework of theplant, and preferably that part making up the plate offur-nacef2, areupstanding sleeves 20, 20, identical in form and arrangement withsleeves except thatthey do not upstand quite so high to accommodate'themovement of the `parts carried thereby.` A shaft 21 is journfaled in thesleeves `and keyed -or otherwise iXed` toV eyes 22 pendent from lever23, theshaft 21 being identical'with shaft 16,eyes 22 with eyes` 17, andleve-r 23 with lever 18, the lever 23 being bifurcated to provide arms24 similar to arms 19. These parts being identical will be understood tobe disclosed on an enlarged scale in Figures 2 and 3, though theseiigures specifically show only the lever 23 and its connected parts.

Each -of the shafts 16 and 21 extends i transversely of the plant tobeyond theside respect to lever 23.

thereofand is provided with actuating mechanism, such as illustrated anddescribed in my above-mentioned patentand pending applications, so thatthe shaftsmay be readily rocked for oscillated toswing the levers frompositions in advance to positions in the rear, as indicated in `dottedlines in Figure 1 with Each of the levers `18 and 23 carries a means ofpick-up and let-go for workor a work-holder, so that the work orwork-holder may belifted by one of the levers from its position in oneofthe receptacles and moved by the lever and released in the otherreceptacle, and then picked up by the second lever and moved from thesecond receptacle to the quenching bath, and vthere released to bedischarged by the discharging tray of the quenching bath; As the pick-upand let-go for the two levers 18 and 23 is identical mechanism, but oneis illustrated in detail and seen in Figures 2 to 6 inclusive.Connecting the two arms of the respectivelever substantially Lat theirfree `ends is a cross rod 25 on which is freely, pivotally mounted apair `of pick-up hooks 26, each hook having `its `lower `end taperedbelow the hook to provide a camming edge 27. As a `means `for preventingthe hooks 26 from sliding along` the rod 25 and to keep them centered onthe rod, a sleeve 28 isinterposed between the hooks and is anchored tothe rod 25 in any appropriate manner, as by a set screw 29. rlhematerial from which the hooks26g` are formed is extended an appreciabledistance beyondthe rod 25 to provide counterbalance plates 30, 30, andsaid plates are clamped together by a through bolt 31 and held `spaced`apart by a sleeve 32 surrounding thebolt 31; The counterbalance thusproduced `is possessed of sufficient weight to allow the hooks 26 `todepend substantially vertically, but incident to such counterbalance`the hooksv 26 swing very easily and freely, and to render the counterbalance in action efective to the end` of causing the hooks to swingwith ease, an adjustable weight is preferably provided for thecounterbalance andmay,` assume the form of a bolt 33 threaded intothefsleevev 32 and carrying a nut 34 which is adapted to be threadedinward or outward along the'bolt 33 according to whether the effectiveweight of the `counterbalance is to be decreased or increased relativeto the hooks 26.`

\ Inthe operation of the levers 18 and 23, their pick-up and let-gohooks 26 are adapted tol cooperate with any appropriate work holderhaving a properly located cross bar Y to receive thehooks and a properly`located camming surface to shift the holder laterally for releasing thehooks, andotherwise a table Qrlike support. The upperend of the bar 35is formed integral with or otherwise appropriately fixed to a cross bar39 outstanding laterally on opposite sides of a suspension and cammingbar 40 which is formed integral with or otherwise fixed to the bar 35and located to extend in a directiony fore and aft relative to thebodily travel of the parts: being shifted by the levers 18 and 23.pension bar because, when thework holder islocated in either of thereceptacles 11 or 12, the terminals 41 of the bar rest on `theoutstanding flange of the respective receptacle while the bar 35hangspendent in the receptacle; `and the bar 40 is referred to as acamming bar because its end portions beneath the projections 41 areformed with inclined faces 42, 42, located to center the work holder inthe respective receptacle when lowered into the same slightly :offcenter. This centering action is the result; of a camming movementoccasionedbyone of the cam faces 42 striking the `curved portion 14ofthe respective receptacle 11 or 12.`

llt is to be observed that the lengthof each of the levers 18 and 23 issuch thatplthe axis of the pivot of hooks 26 extends substantiallybeyond the vertical axis of the respective l `receptacles 11 and 12 whenthe levers are in their lowermost positions as seen in full lines inFigure 1, and thespacing The bar 40 is referred to asa sus-` of theshaft 16 laterally of the vertical axis of the receptacle 12 is suchthat the pivotal axis of hooks 26 of lever 18 lies beyond said verticalaxis of receptacle 12 when the lever 18 is swung through approximatelyone hundred eighty degrees or a little more and brought to a positionwith the free ends of its varms 19 overhanging the receptacle 12. Hence,when the lever 18 is in a raised position and a work holder is manuallyor otherwise positioned -in receptacle 11, and the lever 18 then loweredflown over the receptaele, the cross bar will move to a position beyondthe vertical planes of cross bar 39 and the camming faces 27 of hooks 26will strike the cross bar 39 and ride rearwardly thereon until the biteof the hook passes below the line of bar 39, and as soon as this occursthe hook will swing toward the cross bar 39 until the bite of the hookunderliangs the cross bar so that, if the lever 18 is then liftedupward, the hooks will come into lifting engagement with the bar 39. Itwill be observed that the-housing or enclosure 4 will be properlyprovided with doors and openings for access to various parts, and tothis end it is preferable to have the end wall 43 of the housingterminate short of the full length of the housing, that is have its edgespaced sufficiently above the plate 10 of furnace 1 to leave an entranceopening 44 for the successive introduction of the work holders.

The hooks 26 of lever 18 having engaged the work holder, rotation ofshaft 6 clockwise will cause the lever 18 to be swung to a positionoverhanging the receptacle 12. During this movement, the work holder andits work will have remained suspended in a vertical position whilerelatively travelling through the opening between the arms 19 so thatthe work holder is lowered into the receptacle 12 in the pendent,vertical position. It will be borne in mind that since the rod 25 isspaced from the axis of movementk of lever 18 suiiciently to lie beyondthe rod 39, when the work holder is in receptacle 11, the pivot rod 25will likewise extend beyond the vertical axis of receptacle l2 at theother side thereof from its location with respect to receptacle 11, andthus as the lever 18 lowers the work holder into receptacle 12, the workholderwill enter the receptacle off-center with respect to thereceptacle, and the rear camming edge 42 will thus be caused to engagethe curved portion 14 of receptacle 12, and `willcam the work holderlaterally, that is, in a direction of the length of the bar 40 until thecrossl bar 39 of the work holder reaches a central position with respectto receptacle 12. This shifting movement results in the location of thecross bar 39 nearer the shaft 16 than is the bar 25 when lever 18 islowered down across receptacle 12. Thus, as thev suspension and cammingbar 40 reaches its iinal, seated position on receptacle 2, the hooks 26of lever 18 being swung out of a vertical line relative to their pivotalaxis tend to swing back to that line and a further lowering movement oflever 18, after the seating of the bar 40, releases the hooks 26 fromtheir engagement with bar 39 and allows them to swing to a verticalposition entirely free of that bar. Then the lever 18 may be swung backto its former position overhanging receptacle 11 while leaving thedeposited work holder in its position suspended in receptacle 12. On thereturn movement of lever 18, the hooks 26 engage the bar 39 of the newlylocated work holder which has been introduced while the lever 18 hasbeen depositing the former work holder in receptacle 12.

The action of the pick-up and let-go hooks 26 as thus described is madeclear from Figures 4, 5, and 6. In these igures the lever itself hasbeen omitted for the sake of clarity and only the pivot bar 25illustrated. When lever 18 is lowered across the receptacle 11, thehooks 26, as seen in Figure 4, descend to engagement with and cam acrossthe bar 39, as indicated in dotted lines in Figure 4. Vthen the hook hasreached the dotted line position in Figure 4, it is only necessary toelevate it to bring it into lifting engagement with the cross bar 39,and then, when the parts have been swung from receptacle 11 toreceptacle l2, the suspension and camming bar 4() is cammed to acentering position as indicated in Figure 5, as the work holder is beinglowered into the receptacle 12, and when bar 40 has become centered, thehooks 26 will have moved from the full line position of Figure 5 to thedotted line position thereof, so that a further lowering movement of thecross bar 25 and the parts which carry it will cause the hook 26 toclear the cross bar 39 so that the hooks 26 move from the dotted lineposition of Figure 6 to the full line position thereof,for approximatelyso, and the hooks are then entirely free to be lifted without danger ofengagement with cross bar 39.

The action of the hooks 26 of lever 23 is identically that justdescribed except that the work holder is picked up from the receptacle12 and deposited in the tray 45 in quenching vat 3, and while therelease of the hooks is accomplished in identically the same manner asthat just described, the apparatus arranged within the tray 45 toreceive the work holder is slightly different from the receptaclesll and12, and such apparatus is seen in detail in Figures 7 8, and 9. It is,of course, obvious that practically identically the same type andarrangement of receptacle might be provided within vat 3, or at least asupport having the same marginal arrangement, and an operating lever`identical with levers 18` and 23 might well be used for picking theWork holder up out of the quench and depositing it on the table 7, butbecause the plant is `intended for and adapted to conversion fordischarging `the work holder. The Vtray is a reticulated basketfixed toa rockshaft 46 extending laterally beyond the housing to appropriateoperatingmechanism, such as illustrated and described in myabovementioned patent and pending applications. The opposite edge of thetray 45 from that supported bythe shaft 46 is preferably provided with abracket or brackets 47 adapted tooverhang and engagea Vrail or likesupport 48 forming part of the vat 3g or the framing thereof.

Therefore, to `enable the tray 45 to "serve, as the receiver anddischarging means forV the work holder to and from thevat 3, a cradle orpivotally mounted framework is y carried by the tray and located toreceive and cooperatewith the work holder delivered by lever 23 anditshooks 26 exactlyl as receptacle 12 cooperates with and receives the worklholder from lever 18and its hooks 26. That frame or cradle, as clearlyseen in Figures 7, 8, and 9, `consist essentially of longitudinal bars49, 49, and cross bars 50, 50, connecting the bars 49. The bars 50 maybe merely in the form of bolts or rods, while the bars 49 are preferablyangle bars and from the horizontal web of each bar at acentral pointthereof there depends a weight 51 preferably carriedbya rod or bolt 52anchored to the respective'angle bar. Outstandinglaterally, from each ofsaid angle bars midway of the length thereof is a bracket 53, asbestseen in Figures 7 and 8, each of which brackets is bifurcated at itsfree, downturned end portion to provide a fork 54 adapted to engage andextend on opposite sides of a pivot pin 55, there being a pivot pin 55fixed to and extending inwardly from each side of tray 45. Obviously,the pins 53 may be provided in any appropriate manner, but preferablyconsist of bolts extending through the marginal portions `of the tray 45and engaged at their outer ends by nuts 56, as best seen in Figure 10.Each bolt is shouldered at the in` ner face of the tray so that `the nut56 may effectively clamp the bolt in place and leave aninwardly-extending pivot finger. Ob-

viously,`by backing oif the nut 56 the part 55 in each instance may be`readily removed to leave the tray free of obstruction when the plant istransformed for thehandling of small articles.

Thus it will be seen that `the framework made upA of parts 49 and 50willlie constantly in a horizontal positionowing to the action of theweights51 and the fact that` the `parts are pivotally mounted on the iingers.55, and this position is maintained not#- withstanding the swinging ofthe tray 45 to and from the dotted line position seen in Figure 1.` Eachrod 50 is formed preferably midvvay of its length with a depression 57located to receive the suspension and cam ming bar 40 and to center thework holder lowered into engagement with said depressions 57. Inotherwords, the bars 50 are in that relation to the pivot of lever 23 and thepivotrod 25 of lever 23 that, when lever 23 is lowered above the tray45, the camming face 42 at the rear end of bar 40 will strike `the rearrod 50 and cam the work holder to a .centering position forward ofitslocation at the time of its being lowered by the hooks 26, so thatthe hooks 26 are swung `to an inclined position such as indicated indotted lines in Figure 6, and the further lowering of the lever 23,therefore, frees the hooks from the cross bar 39 and allows the lever 23to return to its former position While leaving the work holder suspendedon the cradle. l y y Y W'hen thework holder has thus been deposited inthe `tray 45, andthe chilling action has been completed, the shaft 46 is`oscillated `toswing the tray 45 to the dotted line position of Figure1, in which position the work holder will rest on its `feet on thetable" 7, and further lowering of the tray will allow the cradle to movesufficiently `below the bar 40.to allow the work holder to be readilymanually removed. By preference, al' part of the housing 4 includes adoor 58 pivoted at 59 `and `connected pivotally by a link 60 to a` partof the frame of tray 45, so that the door will open in advance ofadischarging movement of the tray and will follow the tray and close asthel tray returns to its position in vat 3.

It will thus be seen that the only manual effort required is thelowering of the work holder into receptacle 11 and the removal of thework holder from the table 7,` and it should be apparent that even thesemanual operations could be easily disposed of `where desired by merelyproviding take-up and let-go levers and hooks in advance and in the rearof the plant corresponding to the lever 18 and hooks 26; but for mostpractical purposes it has been found preferable to load the work holdermanually and then deposit the work holder manually to start ess of,V theplant.

the proc-.

It should also be observed that the whole process is one of heattreatment, that iny receptacle 11 being preheating, that in receptacle12 being further heating and further treating as by carbonizing throughthe action of a cyanide bath or the like, and that in the vat 3 beingheat treating inthe sense of quick heat exhaustion or quick lowering oftemperature, and to avoid a negative viewpoint of the action in vat 3,it is believed correct to describe the action as heat treatment, beingmerely a downward heat treatment instead oit' an upward heat treatment.

While the invention is in no sense limited to any particular mounting ofwork on the work holder or any particular form of the work holder, it isnevertheless a fact that for certain work, such as work made up ofcircular bodies having openings therethrough, including gears and thelike, it is desirable to suspend them on arms, such as the arms 36, andto prevent possibility ot parts of work moving or undesirably slidingtoward each other when suspended on the same arm, I prefer to provideserrations or tooth-like projections 61 on the upper edge of the arms36, as seen in detail in Figure 12. Also, at the outer end of each arman upstanding inger G2 is a convenient arrangement to prevent the workaccidentally slipping ofi' of the arm.

While the present invention is especially' well adapted for thetreatment ot' articles of metal work for case-hardening or liketempering, it is not necessarily limited to any such apparatus and iswellv adapted Jfor any of numerous forms of heat treatment of workarticles for known and desirable results.

lVhat is claimed is l. In heat treating apparatus, the combination, withmeans providing a plurality of places of heat treatment, of work holderpositioning means at each of said places, and piek-up means cooperative:with said` work holder positioning means `for bodily movmg a workholder from one place of heat treatment and at another place of heattreatment depositing and releasing thel work holder from the piek-upmeans.

2. In heat treating apparatus, thevcombination, with means providing aplurality' of places of heat treatment, of woik holder positioning meansat each of said places, and pick-up means cooperative with said workholder positioning means for bodily moving a work holder from one placeof heat treatment through an arc to and at another place of heattreatment depositing and releasing the work holder from the pick-upmeans.

3. In heat treating apparatus, the combination, with means providing aplurality of places of heat treatment, of work holder positioning meansat each of said places, and piek-up means cooperative with said workholder positioning means for-bodily moving a vwork holder from one placeof heat treatment through a vertical arc to and at another place of heattreatment depositing and releasing the work holder from the pick-upmeans.

4. In heat treating apparatus, the combination, with means providing aplurality of places of heat treatment, of work holder positioning meansat each of said places, and pick-up means cooperative with said workholder positioning means for bodily moving a work holder upward out ofone place of heat treatment and out of contact with supporting meansother vthan said pick-up means and for moving the work holder to andlowering it into another place of heat treatment, and depositing andreleasing the work holder at the second-mentioned place tree of saidpiek-up means.V

5. In heat treating apparatus, the combinatioinwith means providing aplurality oi places of heat treatment, of work holder positioning meansat each of said places, work holder carry ng means mounted toreciprocate l? t *een the places of heat treatment, and means on thework holder carrying means cooperative with said work holderpositioninf` means for automatically picking up work holder at one ofthe places of heat treatment and for automatically releasing the workholder at the other.

6. In heat treating apparatus, the combination, with means for providinga plurality of places ort heat treatment, of work holder carrying meansmounted to move between the places of heat treatment, a hook comprisedin said carrying means being pivotally dependent from a part thereof andlocated with itspivotvdisposed with relation tothe places oi. heattreatment to extend at one side of the place of engagement of the hookwith a work holder for causing the hook to engage and release the workholder for automatically lifting the work holder from one place of heat'treatment and depositing and releasing it at another.

7. AIn heat treating apparatus, the combination, with means providing aplurality of places of heat treatment, of work holder carrying meansmounted to move between the places of heat treatment, a hook comprisedin said carrying means being pivotally dependent from a part thereof andlocated with its pivot disposed with relation to the places of heattreatment to extend at one side oi the place of engagement of the hookwith a work holder for causing the hook to engage and release the workholder for automatically lifting the woi'k holder from one place of heattreatment and depositing and releasing it at another, and means forautomatically shitting the work holder relative to the pivot ot saidhookfor eifecting releasing movement of the hook.

`ally dependent from a part thereof and located with its pivot disposedwith relation to the places of heat treatment to extend at one side ofthe place of engagement of the hook with a work holder for causing thehook to engage and release the work holder for automatically lifting thework holder from the place of heat treatment and depositing andreleasing it at another, and gravity-actuated means for shifting thework holder relative to the pivot of said hook for effecting releasingmovement of the hook. i

9. The combination, with means providing` a plurality of places of heattreatment, of an operating lever for shifting work from one place ofheat treatment to another, a hook pivotally carried by said lever andpendent therefrom, the pivot of said hook being located to lie beyond apredetermined point of one of the places of heat treatment when thelever is moved to overhang such place of heat treatment and to lie atthe relatively opposite side beyond a corresponding point of the otherplace of heat treatmentwhen the lever overhangs the latter place, a workholder adapted to be engaged by said hook in the line of saidpredetermined point of the first-mentioned place of heat treatment, andmeans for shifting the work holder to the said predetermined point ofthe second place of heat treatment on being delivered at said secondplace of heat treatment by said lever and hook, whereby the place ofengagement between the lever and hook at the second place of heattreatment is shifted out of alinement with the pivot of the hook forreleasing the hook and allowing the work holder to be deposited andreleased at the second place of heat treatment.

, 10. The combination, with means provid-` ing a plurality of places ofheat treatment,

0` lever for shift-ing work from of an operatin one place of heat`treatment to another', a

\ tively opposite side beyond a corresponding point of the other placeof heat treatment when the lever overhangs the latter place, a workholder adapted to be engaged by said hook in the line of saidpredetermined point of the first-mentioned place of heat treatment,means for shifting the work holder to the said predetermined point ofthe second place of heat treatment on being delivered at said secondplace of heat treatment by said lever and hook, whereby the `place ofengagement between the lever and y hook at `the second place of heattreatment is shifted ont of alinement with the pivot of thehook forreleasingthe hook and allow-` ing the work holder to be deposited andreleasedat the second place of heat treatment,

anda c'onnterbalance for thehook for facilitating swinging thereof to a`released position:

1l. The combination, with means providing a plurality of places of heattreatment, of an operating lever for shifting work from one place ofheat treatment to another, a hook `pivotally carried by said lever andpendant therefrwom, the pivotof said hook being located to lie beyond `apredetermined point of one of the placesof heat treatment when the leveris movedto overhang such place of heat treatment and to lie at therelatively opposite side beyond a corresponding point of the other placeof heat treatment when the lever overhangs the latter place, a workholder adapted to be engaged by said hook in the line of saidpredetermined point` of the first-mentioned place of heat treatment,means for shifting the work holder to the said predetermined point ofthe second `placeof heat treatment on being delivered at `said secondplaceuof heat treatment by said lever and hook, whereby the place ofengagement-between the `leveraird `hook at the second place of heattreatment is shifted ont of alinement with-the pivot ofthe hook forreleasing the hook and allowing the work holder to be deposited andreleased at the second place of heat treatment, and means to swing thehook to a released position.

12. The combination, with means providing a plurality of places of heattreatment, of a work holder having a camming surface adapted tocooperate with the parts at said places of heat treatment for centeringitself relative thereto, a hook receiving member carried by the workholder, an operating lever swinging between the places of heattreatment, a hook pivoted to and pendent from Said lever in position forhaving the axis of the pivot of the hook at one side of the place of thehook-receiving means when the work holder is centered, the location ofthe pivot of the hook being such relative to the second place of heattreatment as to extend at that side and beyond the hook-engaging meansof the work holder at which the hook opens for causing the hook toassume an inclined position as the work holder is cammed to a centeringposition, whereby lowering of the hook will cause gravity movementthereof laterally of the hook-engaging means of the work holder and thusrelease the hook from engagement.`

llO

13. The combination, With means providing a plurality of places of heattreatment, and a work holder adapted to cooperate therewith, of a leverpivoted to swing from a position overlying one of the places o'f heattreatment to a position overlying the other, Said lever being bifurcatedand provided with an opening of a size sufficient to aecommodate thepassage of the Work holder, a hook pivotally carried by the lever adjaeent the free ends thereof adapted to engage the Work holder ior movingthe same from one place of heat treatment to the other, and means forshifting the Work holder on reaehing the second place of heat treatmentfor releasing the engagement of the hook.

14. In heat treating apparatus, the combination of means providing aplurality of places of heat treatment, means for shifting a Work holderfrom one place' of' heat treatment to another place of heat treatment, apivotally mounted cradle at the last-mentioned plane of heat treatmentfor receiving and sustaining the Work holder in a vertical position, andmeans for .swinging the cradle from the place of heat treatment to adischarge position While maintaining the same With the Work holder in avertical position.

15. In apparatus of the class described, the combination, with adischarge tray for heat treated Work, of a cradle pivoted thereto andeounterbalaneed to maintain a horizontal position, said tray havingmeans for D receiving and sustaining a Work holder in a vertical,suspended position.

In testimony whereof I aix my signature.

HEYMAN ROSENBERG,

